Improvement in drop-hammer lifters



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Drop-Hammer Lifters.

N0. 142,723. Patented Septe mber 9,1873.

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UNITED Snares Parana Orrron.

CHARLES PECK, OF NEW HAVEN, CONNECTICUT, ASSIGNOR T O MILO PECK ANDCHARLES PECK, OF SAME PLACE.

IMPRQVEMENT IN ERQWHAMMER LEFTERS.

Specification forming part of Letters Patent No. H EQflQit, datedSeptember 9, 1873; application filed April 15, 1873.

To all whom it may concern:

Be it known that I, CHARLES Pack, of the city and county of New Havenand State of Connecticut, have invented a certain Improvement inDrop-Press Lifters, of which the following is a specification Myinvention relates to lifters employed for raising the drops ofdrop-presses; and con sists in a novel construction and arrangement ofparts which have for their object to improve the operation of saidlifters, as will be fully set forth hereafter.

Figure 1 represents part of the drop-lifter in perspective with myimprovement attached, and Fig. 2 a side elevation.

A A represent the standards or hangers, which afford bearings for theshaft B, to which is attached the crank C for imparting a reciprocatingmotion to the drop. On the shaft B. is a sleeve-shaft, D, carrying theratchet-wheel E. The arm F is rigidly attached to the shaft B, and hasprojecting from the side next the ratchet-wheel a pin, a, on which worksthe pawl or dog I), and as the sleeve is revolved the pawl engages withthe ratchet and elevates the crank C, to which is attached the weight ordrop; and as the crank has slightly passed the upper vertical point, theguard c throws out the pawl and allows the drop to fall, when the pawlis again engaged with the ratchet, and the weight thus alternatelyelevated and dropped.

This mechanism for operating the drop is old, and my invention does notcomprise it 3 but heretofore considerable trouble and inconvenience hasbeen experienced in the use of the springs for keeping the pawl incontact with the ratchet, and my invention is intended to obviate thisand produce a better spring.

On the upper part of the pawl ashoulder, i,

is formed, against which presses the curved der and around the horn e,which projects from v the arm F, while the upper bend passes over andaround the pawl b, and bears against the shoulder. A hole is drilled inthe projection e, and also in the part of the bar 61 that passes aroundit, and through these holes a screw, h, is passed; and on this screw,against the bar 61, is pressed a spring, f, which may be either ofrubber or of metal. The spring is kept against the foot of the bar at bymeans of the washer and nut g, anl can be readily and accuratelyregulated, as regards pressure, by screwing or unscrewing the nut g.

By this mode of constructing and arranging the parts of the spring Isecure a long movement of the end of the pawl with but a slightcompression of the spring, and constructed according to my invention thepawl operates more perfectly; and the spring can be easily repaired, ora new one inserted, by any unskilled workman, its adjustment beingaccomplished by the screw and nut, or other equivalent devices.

I claim The combination, with the ratchet-wheel E, pawl 11, andcam-guard c, of the S-shaped lever d and spring f, constructed andoperating substantially in the manner described.

- CHARLES PECK.

Witnesses:

(Bananas ROBINSON, E. O. ltoor.

